If you are looking for a tool to give you dead on accuracy, try out the October Mountain Products Tru-Center Laser Alignment Tuning Aid. This is a professional tool for cam, arrow rest and center shot alignment. Powerful 3mw Laser aids in achieving center shot in seconds. Aluminum construction, built in level, knurled knob for easy alignment set up and a pivoting sight body to fit on any bow. Operates on three (3) LR44 batteries (included) and may be converted from right hand to left hand.